The supervisor and representative told me you have to detach the watch from digits and make it standalone. Search through the T-Mobile forum someone wrote out step by step what you need to tell them when you call.
I know it's frustrating, but don't give up. Your watch can work as a standalone device, if set up properly.
Yes, I think they do that because they think people don't want standalone. Digits is similar to the virtual number for CC when using apple pay/google pay, but the number can't be called nor can it call out. Pay for a separate line/number for the watch and it should be good.
It is a huge issue in the Tmobile community and comes across as sabotage to the consumer, Samsung, and is damaging Tmobiles already tarnished reputation. I've had people in their ( T-Mobile's) escalated tech support department tell me those exact words.
Bottom line is any of Samsung's( later versions) LTE watches can be used as standalone/ seperate line and they do not have to be tied/paired with Tmobile digits as alot of Tmobiles reps are saying. I'm not sure if they have a bias for Apple products or what, but the bold face lies, lack of knowledge from rep to rep is just insane.